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March 15, 1932. w. F. KEENAN', JR

COMBINATION ls'umwacAV` .2 'sheets-sheet Filed July 5, 1928 March 15, 1932. w. F. KEENAN, JR

COMBINATION FURNACE Filed July 5, 1928 2 Sheets-Sheet 2 INVENTOR. 'I

l l l l l ,l of? ATTORNEY PAUL VAN CIL, 0E CHICAGO, LLXNOIS.

cotnsrntn'rune.

Specification of Letters lateiit.` Patented Jamin, 9, 11.9115.

Application led February 18, 1.914,. XSerial No. 819,376.

To dll whom t may concern:

Be it known that I, PAUL cago, in the countyaoffCook and State of lllinois, have invented certain new and useful Improvements in Collapsible4 Tubes, of which the following isa Vspeciication.

The present inventionv has reference to certain improvements in collapsible tubes.

The main object of the invention is to reinforce or stiffen or strengthen the lower end of the tube to* enable the saine to withstand the hydrostatic pressure resulting when the tube is squeezed'fto-expel its contents, which may be aste, .cement, or any other substance, or which may be due to ei.- pansion of the liquid caused by an elevation of temperature.

The features of the present inventionare particularly useful in connection with that type or form"` of collapsible tube which is 'made from seamlesstiinhing-that is, a tubing which is not seamd along its side, but those novel features are not limited to such a use, nor to a combination with only such a form of tube.

The collapsible tubes to which the disclosures of the present invention are particularly applicable have one end closedo byl bending the metal back on itself one or more times to produce a fold constituting what is hereinafter termed the closed end. When a hydrostatic pressure is developed in such. a

tube to expel the contents through its defi-,

livery end, a tendency also arises for this pressure to unfold the end portion, and therefore when subject to an excess of pressure such tubes are liable to open or unfold at their closed ends. The main object of the present invention is to reinforce or strengthen this closed end by crimping or corrugating the folds of the metal so as to impart thereto a greater stidness inthe direction in which the unfolding pressure is exerted. At the same time another object is to improve the appearance of this closed'end of the tube by means of this crimping, thereby obtaining an additional beneficial result.

Other objects and uses will appear from a detailed description of the invention, which consists in the features of construction and v VAN CLEEF,

citizen of the United States, residing at Chi- Vcombinations of parts hereinafter described and claimed.

*y In the drawing-Figure 1 shows a side4 view of ah complete tube looking toward the front of 'the folded portion, this portion being provided with one form of crimp; F ig. 2 shows a section taken on the line 2-2 of Fig. 1 looking in the direction of the arrows; Fig. 3 is a vicw looking toward the front of the lower portion of the fold of the* A, tube.. provided with amodii'ed forni bf or bent over v'a desired number of times to provide an effective closure therefor. One

form of this fold is shown in Fig. 7, where#V crimp; Fig. 4 is a sectiontalrenonfthie-line` 1 -t of Fig. 3 looking `in `the direction of the,-p

in a complete double foldffiis i11uStI'ated'-i-n l.

providing this foldedclosure the metalfof the tube body is tapered down from'bo'th sides as at 10, with theresult'that the bottom 0r closed end of the ytubeis comparatively iat, as best shown in Fig'. .7.

f.. lhcn the material containeolf'within the tube is be expelled the cap. 11 -is removed 'from the delivery end, and the body portion is squeezed to create the desired hydrostatic pressure. p, rlhis pressure is v.exerted u niformly on lall equal areas of the containing vessel, including the bottom portion 10, being exerted at right angles to the surface at every point. Inosmuch as the bottom or closed end of the tube is not perfectly Hat, it follows that there will bea tendency for the portions 1:2 and 13 of the bottom of the tube to ush away from each other on account ofp the fact that they lie at an angle to each other. There will also be a tendency for the liquid or other plastic contents to work its way down and into the crack or seam 14 along the inner edge of the fold. This latter action will be augmented or enhanced by the tendency for the portions 12 main combustion chamber H and a long flaming fuel, such as wood refuse, in the auxiliary combustion chamber H. W' ith this purpose in mind, l have provided a fuel burner nozzle P arranged in an inclined passage F in the front wall section E for injecting a stream of finely divided fuel into the main combustion chamber. The nozzle l? is connected at its outer end to a conduit P2 conveying powdered coal from a fuel pulverizer P3 driven by an electric motor F4. The .pulverizer and motor are mounted on the floor 0, as shown. Air inlet ports F5 are arranged in the wall section E below the nozzle inlet for introducing the combustion supporting air. An ignition door P5 is also provided directly below the nozzle P and through which a torch or other igniting means may be inserted for initially firing the combustible mixture.

The fuel jet expands in the manner illustrated by the broken lines in Fig. l and the heated gases pass upwardly into the tube bank. The solid. products of combustion drop either directly to the ash receiving door F4 or onto the inclined wall section F2 from which they pass by gravity to the floor F4. The floor F4 and wall section F2 are provided with air passages F5 and F 6, respectively, for preventing the formation of slag. Doors F7 are provided in the lower wall section F3 through which the ashes can be removed. A radiant heat absorbing steam superheater F8 comprising a plurality of parallel tubular elements connected to external headers is arranged at the inner side of the wall section F.

The provisions for introducing and burning wood refuse in each auxiliary combustion chamber H comprise horizontally spaced fuel inlet openings R in the lower part of the inclined wall section E2. Each wall opening R is connected by an inclined chute R to the upper run of an endless conveyor R2 extending transversely of the steam generator unit A. Suitable means are arranged for discharging the fuel from the conveyor buckets into each fuel chute R. The lower` end of each chute is closed by a counterweighted gate R5 adapted to be operated from the lower floor O.

The fuel allowed to pass through the openings R falls onto a horizontal grate S mounted on suitable sup orts S rest-ing on the floor O. The grate extends from a point on the bridge wall Et, preferably less than half the height thereof, to the front wall section E5. Air inlet openings (not shown) are connected to the space below the grate. Air inlet ports E5 are also arranged in the upper part of the wall section E3 for the entrance of combustion supporting air. Doors E5 provide access to the space below the grate S for removing ashes accumulating therein. The refuse is preferably piled on the grate S to the wood refuse are burned simultaneously and when either is burned alone. The location of the wood burning furnace gives a long length of flame travel for the high volatile long flaming wood refuse. This is especially effective when both fuels are burned as the two flames meet in the main combustion chamber and assist each other in maintaining a high combustion efficiency. The arrangement is further characterized by the fact that the ash resulting from the combustion in the main chamber deposits in a separate ash receiving space and not into the auxiliary chamber to interfere with the combustion of the wood therein. The combustion chambers are so arranged that either the powdered fuel or wood refuse may be burned alone with a high combustion efficiency. When powdered fuel is burned alone, the transverse bridge wall protects the grate from destruction by the radiant heat of the fuel burning in suspension.

While in accordance with the provisions of the statutes, I have illustrated and described the best form of embodiment of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed withoutl departing from the spirit of my invention as set forth in the appended claims and that in some cases certain features of my invention may be used to advantage without a corresponding use ofy other features.

`Having now described my invention what I claim as new and desire to secure by Letters Patent, is:

1. A combination furnace comprising in combination a vertically elongated main combustion chamber of substantial volumehaving vertical front and rear wall sections, means in one of said' walls for injecting fuel into said main combustion chamber to be burned in suspension therein, an auxiliary combustion chamber having an inclined top wall, the upper end of which extends towards 'said main combustion chamber into contsct with said vertical front wall section, and opening at one side to the lower portion of said main combustion chamber, a grate located in the lower part of said auxiliary chamber, and a bridge wall extending vertically between said grate and said main combustion chamber, arranged to protect said grate from the radiant heat of the fuel burning in suspension in said main chamber.

2. A combination furnace com rising a main combustion chamber having ront and rear vertical walls, means-mounted in one of said walls for injecting fuel into said main chamber, an ash pit at the bottom of said main chamber, an auxiliary combustion chamber below and at one side of said main chamber, a grate in the lower part of said auxiliary chamber, means for passing asecond fuel onto said grate, an ash pit below said grate and a vertically extending bridge wall partially separating said combustion chambers and in approximate alignment with said .front wa l.

3. A combination furnace comprising vin combination a main combustion chamber having vertical front and rear wall sections, a downwardly inclined powderedfuel nozzle mounted in said front wall section, an inclined rear wall in the lower part of said chamber, an ash receiving space at the bottom of said inclined wall, an auxiliary com bustion chamber in front of and connected to the lower portion of said main chamber, a grate mounted in said auxiliary chamber, means for introducing fuel into the upper part of said auxiliary chamber, an ash receiving space below said grate, and a transverse bridge wall mounted between said ash receiving spaces and in approximate vertical align- V ment with the front wall of said main combustion chamber.

4. A combination furnace comprising a main combustionchamber having front and rear vertical wall sections, means for burning finely divided fuel in suspension in said main chamber, an ash receiving space at the bottom of said main chamber, an auxiliary combustion chamber below and in front of said main chamber, a bridge wall partially separating said chambers, means for burning a long flaming fuel in said auxiliar chamber, and means for introducing a hig J percentage of excess air into the upper part of said auxiliary chamber, whereby sufcient air for complete combustion of said finely divided fuel is present where the burning ases from said auxiliary chamber meet the blel burning in suspension in said main cham- 5. In a steam generating installation comt prising a main combustion chamber having .vertically arranged enclosing walls and a comminuted fuel supply nozzle located in at the normal boiler room oor level and said auxiliary chamber walls at a. lower floor level, and connecting the walls of said chambers into a continuous wall structure.

6. In a steam generating installation com prising a main combustion chamber having vertically arran ed enclosing walls and a comminuted fue supply nozzle located in one of said walls, and an auxiliary combustion chamber arranged below and at one side of said main chamber and having walls defining the same and means for receiving and burning a long flaming fuel in said auxiliary chamber, the improvement which consists in supporting the main chamber vertical walls at the normal boiler room oor level and said auxiliary chamber walls at a lower floor level, connecting the walls of said chambers into a continuous wall structure, and arranging means for conveying fuel to said auxiliary hamber on the underside of said boiler room oor.

Signed at New York city, in the' county of 

